Experimental Observation of Strong Edge Effects on the Pseudodiffusive Transport of Light in Photonic Graphene
Experimental Observation of Strong Edge Effects on the Pseudodiffusive Transport of Light in Photonic Graphene
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DOI：
10.1103/physrevlett.104.043903
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发表时间：
2010-01-29
影响因子：
8.6
通讯作者：
de Dood, Michiel J. A.
中科院分区：
文献类型：
--
作者：
Zandbergen, Sander R.;de Dood, Michiel J. A.
光子石墨烯是一种类似石墨烯的二维光子晶体结构。我们将直径为5mm的Al2O3棒放置在晶格常数为a = 8 mm的三角形晶格上，在17.6 GHz的微波频率下，在光子带结构中产生孤立的锥形奇点。在此频率下，测量到的微波通过完美有序结构的传输进入伪扩散状态，其中传输与晶体厚度L成反比（L/a大于或接近5）。传输主要取决于边缘的配置：对于以之字形边缘终止的结构，可以观察到与传输幅度相当的明显振荡，而对于具有直边配置的样品，则不存在这些振荡。
Photonic graphene is a two-dimensional photonic crystal structure that is analogous to graphene. We use 5 mm diameter Al2O3 rods placed on a triangular lattice with a lattice constant a = 8 mm to create an isolated conical singularity in the photonic band structure at a microwave frequency of 17.6 GHz. At this frequency, the measured transmission of microwaves through a perfectly ordered structure enters a pseudodiffusive regime where the transmission scales inversely with the thickness L of the crystal (L/a greater than or similar to 5). The transmission depends critically on the configuration of the edges: distinct oscillations with an amplitude comparable to the transmission are observed for structures terminated with zigzag edges, while these oscillations are absent for samples with a straight edge configuration.